JP4076015B2 - Concrete propulsion pipe - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
The present invention relates to a concrete propulsion pipe used in a propulsion method for sewer pipes and electrical installation pipes.
[0002]
[Prior art]
In sewer pipes and electrical pipes, the outer peripheral surface of a concrete propulsion pipe (hereinafter referred to as a concrete propulsion pipe) used in the propulsion method is formed with the concrete surface exposed as shown in FIG.
Further, conventional concrete propulsion tube in order to reduce the frictional resistance in jacking method, covers the outer peripheral surface of the fume tube with FRP (fiberglass plastic) such as a thermosetting resin. Furthermore, there is a concrete propulsion pipe manufactured by coating a water-repellent modified silicone coating agent or the like on the outer peripheral surface (see, for example, Patent Document 1).
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 11-50783 (page 2-7)
[0004]
[Problems to be solved by the invention]
(1) Conventionally, when a concrete fume pipe is used for the propulsion method, the outer surface resistance of the pipe is larger than that of a PVC pipe or the like because the surface of the fume pipe is rough.
That is, the propulsion resistance applied to the pipe is Fp = Fo + R · S · L based on construction experience, and the pipe outer surface resistance is described in the literature as follows.
Where Fp: Propulsion resistance (tf) [KN]
Fo: Initial resistance (tf) [KN]
R: pipe outer surface resistance (tf / m2) [KN / m2]
S: Pipe outer circumference (m)
L: Promotion extension (m).
This is the resistance R on the outer surface of the pipe in loam, sand-mixed clay, silt, and medium fine sand.
ROHM Sand mixed clay Silt Medium sand Sand Concrete 0.8 0.8 1.0 1.0 1.2
PVC 0.1 0.15 0.2 0.25
As a result, there is a problem that the propulsive force of the concrete propulsion pipe is increased and long-distance propulsion cannot be performed well in the construction of the propulsion method.
[0005]
(2) On the other hand, in the case of a propulsion pipe whose outer peripheral surface is coated with FRP (glass fiber plastic) or a propelling pipe coated with resin to form a coating film on the outer peripheral surface as in Patent Document 1, the outer peripheral surface The frictional resistance can be reduced, and long-distance propulsion construction is also possible. However, when resin paint is sprayed on the outer peripheral surface of a concrete propulsion pipe with a large diameter and weight, a lot of resin, etc. is scattered around during painting, resulting in waste of the paint and work sagging. However, there are problems that the resin is scattered and the working environment is deteriorated, and further that these resin coatings are expensive, so that the product is also expensive.
[0006]
(3) By the way, the concrete propulsion pipe has an inner diameter of φ200 mm to φ3000 mm, that is, a small-diameter concrete propulsion pipe to a large-diameter concrete propulsion pipe, and has a large diameter, a long pipe length, and a heavy weight, Large-scale equipment is required for painting work and FRP mounting work, and a lot of equipment costs are required. As a result, there is a problem that the material cost becomes high and the product cost becomes high due to the time and labor required for construction.
[0007]
The present invention has been devised in view of the above problems, and an object of the present invention is to provide a concrete propulsion pipe having a long propulsion distance that can reduce frictional resistance by relatively simple work and equipment.
[0008]
[Means for Solving the Problems]
In order to solve the above problems, a concrete propulsion pipe according to claim 1 of the present invention is
Lubricant or filling to be injected between the outer peripheral surface of the propelling pipe and the ground, with an insertion opening at one end in the tube axis direction, a collar fixed at the other end, and an injection hole in the middle. In order to reduce the frictional resistance with the agent, in the concrete propulsion pipe that forms a resin film on the outer peripheral surface of the propulsion pipe excluding the inlet and the injection hole, the resin film is formed of a tube-shaped resin tube, the back surface of the resin tube, during heating is characterized in that to form an adhesive layer in which the adhesive is applied with only adhesive strength after adhesion less, heating.
[0009]
In the invention of claim 2 according to the present invention,
Lubricant or filling to be injected between the outer peripheral surface of the propelling pipe and the ground, with an insertion opening at one end in the tube axis direction, a collar fixed at the other end, and an injection hole in the middle. In a concrete propulsion pipe that forms a resin film on the outer peripheral surface of the propulsion pipe excluding the inlet and the injection hole in order to reduce frictional resistance with the agent, the resin film is formed of a resin tape formed in a tape shape On the back surface of the resinous tape, an adhesive layer is formed which is coated with an adhesive having a low adhesive force when heated and having an adhesive force only after heating.
[0010]
In the invention of claim 3 according to the present invention,
Lubricant or filling to be injected between the outer peripheral surface of the propelling pipe and the ground, with an insertion opening at one end in the tube axis direction, a collar fixed at the other end, and an injection hole in the middle. In order to reduce the frictional resistance with the agent, in the concrete propulsion pipe that forms a resin film on the outer peripheral surface of the propulsion pipe excluding the inlet and the injection hole, the resin film has a length excluding the inlet. The entire outer peripheral surface is formed of a resin sheet formed in a width that can be covered in the circumferential direction, and an adhesive having a low adhesive force when heated and having an adhesive force only after heating is applied to the back surface of the resin sheet. It is characterized by forming an adhesive layer.
[0011]
In the invention of claim 4 according to the present invention,
Lubricant or filling to be injected between the outer peripheral surface of the propelling pipe and the ground, with an insertion opening at one end in the tube axis direction, a collar fixed at the other end, and an injection hole in the middle. In order to reduce the frictional resistance with the agent, in the concrete propulsion pipe that forms a resin film on the outer peripheral surface of the propulsion pipe excluding the inlet and the injection hole, the resin film is formed of a tube-shaped resin tube, A reinforcing member is disposed and bonded to the cavity of the resin tube.
[0012]
[Action]
The concrete propulsion pipe is continuously joined from the starting shaft with a hydraulic jack, and the propulsion method is performed while injecting lubricant and filler into the ground from the injection hole of the concrete propulsion pipe. In the case of this propulsion method, the propulsion distance of the concrete propulsion pipe can be propelled for a long distance because the frictional resistance is reduced by the resin coating as compared with the case of the concrete propulsion pipe having the outer peripheral surface.
[0013]
In addition, in the mud concentration propulsion method that collects the earth and sand at the time of drilling as muddy water and recycles this water, when the muddy water is carried outside, the outer surface of the concrete propulsion pipe is filled with ground improvement agent By injecting a delayed-curing lubricant that also serves as a material, the concrete propulsion pipe floats in the cutting hole and does not contact the rock, so the resin coating surface of the propulsion pipe is not damaged and the frictional resistance is also low. The propulsion distance could be increased by reducing the distance.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
FIGS. 1 to 15 illustrate an embodiment of the present invention. A first embodiment illustrating the principle of the present invention will be described with reference to FIGS.
The present invention mainly relates to a concrete propulsion pipe 1 used for construction of a propulsion method for sewer pipes, electric pipes and the like.
The concrete propulsion pipe 1 is also applied to a fume pipe, a vinyl chloride pipe, a ceramic pipe, and a steel pipe used in sewer pipes and electric pipes.
The concrete propulsion pipe 1 is provided with a slot 13 at one end 11 in the pipe axial direction, a collar 14 fixed at the other end 12, and several injection holes 4 at predetermined positions in the middle.
[0015]
The injection hole 4 is used for injecting a lubricant and a filler (not shown) from the inside of the propelling pipe 1 into the ground, and a reverse valve (not shown) is inserted into the injection hole 4 to reverse the flow of groundwater. A lubricant and a filler are injected while preventing the above, and after the injection is completed, a socket (not shown) is fitted and sealed.
[0016]
A resin film 5 is formed on the entire outer peripheral surface excluding the insertion port 13 and the injection hole 4. The resin coating 5 uses a resin material that exhibits an effect of reducing the frictional resistance between the injection hole 4 and the lubricant or filler injected between the outer peripheral surface of the propulsion pipe and the ground.
[0017]
The resin film 5 is formed of a thermoplastic resin, a resin that chemically repels the components of the lubricant or filler, a heat-shrinkable resin, and the like.
Examples of the thermoplastic resin include polyvinyl chloride (PVC), polyethylene (PE), polystyrene (PS), and polyethylene terephthalate (PET). These thermoplastic resins have a large chemical repulsion compared to “nylon”, “epoxy resin” and the like.
[0018]
That is, a material having a small surface energy has high symmetry and does not have polarity, so that it is difficult to wet with water. The relationship between specific materials and surface energy is
Material Surface energy Iron 2030
Epoxy resin 46, 47
Polyvinyl chloride (PVC) 39, 41.9
Nylon 46
Polyethylene (PE) 31
Polystyrene (PS) 33
Polyethylene terephthalate (PET) 43
[0019]
In addition, the resin material that chemically repels the components of the lubricant or filler is chemically repelled with the lubricant or filler by the type of the resin raw material or surface wax processing, etc., and merely reduces physical frictional resistance. In addition, it is possible to further reduce the frictional resistance by utilizing chemical repulsion. The chemically repellent resin material also has a diffusion effect on the lubricant.
[0020]
The above-mentioned “chemically repulsive” means that the difference in “wetting” due to Gibbs free energy change ΔG between the resin material and the lubricant or filler and the difference in the hydrophilic group / lipophilic group of the resin tube. It is a general meaning of electric repulsion.
[0021]
Further, a resin tube 51 formed into a tube shape having a hollow portion 51a in the center by a thermoplastic resin, a resin chemically repelling against the components of the lubricant or filler, a heat shrinkable resin, etc., a narrow tape It is formed on a resin tape 52 formed in a shape. The resin tube 51 and the resin tape 52 determine the width and thickness corresponding to the diameter and size of the propulsion tube. For example, the width of about 150 to 400 mm and the thickness of about 30 μ to 100 μ Workability is good.
[0022]
Further, a resin sheet 53 formed of a thermoplastic resin, a resin that chemically repels components of the lubricant or filler, a heat-shrinkable resin, etc. is shown in FIGS. 5 and 6 illustrating the third embodiment. In the direction of the tube axis of the propulsion tube 1 in which the collar 14 is fixed to the other end portion 12, the entire length of the outer peripheral surface of the propulsion tube 1 is circumferentially formed. It is formed in a width that can be covered by one rotation. When the resin sheet 53 is wrapped or stuck on the outer peripheral surface of concrete propulsion, the work is performed after the adhesive 56 is adhered to the starting point.
[0023]
Further, as shown in FIG. 15 illustrating the ninth embodiment, the resin tube 51, the resin tube 51, the resin tape 52, and the resin sheet 53 can be wound and pasted easily and reliably. An adhesive layer 58 is formed on the back surface of the resin tape 52. The adhesive layer 58 has a low adhesive strength when heated and is coated with an adhesive having an adhesive strength only after heating.
[0024]
Further, as shown in FIG. 14 illustrating the eighth embodiment, an adhesive layer 58 is formed on the back surface of the resin sheet 53. The adhesive layer 58 is coated with an adhesive having a low adhesive strength when heated and having an adhesive strength only after heating. ing.
[0025]
The adhesive layer 58 may be printed on the resin tube 51, the resin tape 52, and the resin sheet 53, and is semi-cured to such an extent that the viscosity is eliminated. The adhesive layer 58 using this adhesive is not sticky at the time of winding, and can be adhered while being contracted at the time of heat shrinkage.
[0026]
Further, in order to enhance the shrinkage characteristics, tensile strength, etc. of the resin coating 5, a reinforcing member 55 is disposed in the cavity 51a of the resin tube 51 as shown in FIGS. 10 and 11 illustrating the sixth embodiment. May be bonded together.
[0027]
Further, as shown in FIGS. 12 and 13 illustrating the seventh embodiment, a reinforcing member 55 may be bonded to the back surface of the resin tape 52.
In addition, it is preferable to use the back surface of the resin sheet 53 to which the reinforcing member 55 is bonded in the same manner as the resin tape 52.
[0028]
The reinforcing member 55 is made of a material such as a glass cloth fiber cloth. In the case of the resin tube 51, the resin tape 52, and the resin sheet 53 using the reinforcing member 55, each physical property such as shrinkage characteristics and tensile strength is improved by forming the resin film 5 in a laminated structure. I can do it.
[0029]
Next, as shown in FIGS. 3 and 4 illustrating the second embodiment, the resin coating 5 uses a resin tube 51 or a resin tape 52, and the length direction of the resin tube 51 or the resin tape 52 is shown in FIG. The ends are overlapped and spirally wound from the propulsion tip 15 toward the rear 16.
[0030]
A stepped portion F is formed in the overlapped portion of the resin tube 51 or the resin tape 52 wound spirally, and the presence of this stepped portion F causes the return phenomenon of the concrete propulsion pipe 1 during construction of the propulsion method. Can be prevented.
[0031]
Also, the resin coating 5 uses a resin tube 51 or a resin tape 52 as shown in FIGS. 7 and 8 illustrating the fourth embodiment, and this resin tube 51 or resin as in the second embodiment. The lengthwise ends of the tape 52 are overlapped and wound spirally from the propulsion tip 15 toward the rear 16 and spirally wound in the opposite direction to be reciprocally wound. As in the case described above, the return phenomenon of the concrete propulsion pipe 1 can be prevented by the presence of the stepped portion F at the portion of the resin tube 51 or the resin tape 52 wound in the lengthwise direction and overlapped in the length direction. When the resin tube 51 or the resin tape 52 is spirally wound, the work is performed after the starting point is bonded with the adhesive 56.
[0032]
Further, as shown in FIG. 9 illustrating the fifth embodiment, the resin coating 5 corresponds to the small-diameter concrete propelling pipe and has a resin cylindrical body having an inner diameter slightly larger than the outer diameter of the small-diameter concrete propelling pipe. The resin cylindrical body 57 is formed on the outer peripheral surface of the concrete propulsion pipe 1 to form the resin film 5.
[0033]
When the resin coating 5 is formed with the resin tube 51, the resin tape 52, and the resin sheet 53 made of heat-shrinkable resin, the resin tube 51 and the resin tape 52 are wound around the concrete propulsion pipe 1 by a predetermined means. Thereafter, after the resin sheet 53 is pasted, it is heated at 80 degrees Celsius using existing facilities such as steam curing maintenance at a fume tube manufacturing factory, or heated by a predetermined means. As a result, the resin tube 51, the resin tape 52, and the resin sheet 53 can be uniformly and smoothly formed on the outer peripheral surface of the concrete propulsion.
[0034]
【The invention's effect】
According to the present invention, the following effects can be obtained.
(1) A resin film capable of reducing frictional resistance can be formed on the outer peripheral surface of the concrete propulsion pipe excluding the inlet and the injection hole with a simple operation. In addition, the resin film can be formed with a small amount of manufacturing equipment, a simple operation, and at a low cost.
[0035]
(2) A propulsion pipe in which a resin coating is formed on the outer peripheral surface of a concrete propulsion pipe can reduce the surface friction resistance as compared with the case where the outer peripheral surface is a concrete-surface propulsion pipe, so that the propulsion distance can be increased.
[0036]
(3) a resin tube, the back surface of the resin tape, upon heating has less adhesive strength, since the adhesive layer in which the adhesive is applied with only the adhesive strength of after heating is formed, a resin tube, a resin The tape can be wound and pasted easily and reliably.
[0037]
(4) The back side of the resin sheet has a low adhesive strength when heated and an adhesive layer coated with an adhesive that has adhesive strength only after heating is formed. And it can be done reliably.
[0038]
(5) An adhesive layer using an adhesive that has a low adhesive strength during heating and that has adhesive strength only after heating is not “sticky” during the winding operation, and can be bonded while being contracted during heat shrinkage.
[0039]
(6) Since the reinforcing member is disposed and bonded to the hollow portion of the resin tube, the shrinkage characteristics, tensile strength, etc. of the resin film can be enhanced. Moreover, a resin film can be made into a laminated structure by adhere | attaching or arrange | positioning the reinforcement member to the cavity part of resin tubes. And each physical property, such as a shrinkage | contraction characteristic and tensile strength, is made favorable and can protect the resin film from the obstruction in a propulsion construction method.
[0040]
(7) Since each resin used for forming the resin film uses a relatively inexpensive resin material, it can be manufactured at a low cost. Moreover, the propulsion construction with a longer propulsion distance can be performed.
[0041]
(8) Since the resin film is formed on the outer peripheral surface of the concrete propulsion pipe, the water honey property of the pipe body in the propulsion pipe is improved. Accordingly, it is possible to prevent intrusion of intrusion water from the outside.
[0042]
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional view of a first embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along line AA.
FIG. 3 is a front view showing a state in which the resin tube of the second embodiment of the present invention is spirally wound in one direction.
FIG. 4 is an explanatory diagram when the resin tube of the second embodiment of the present invention is spirally wound in one direction.
FIG. 5 is an explanatory diagram when a resin sheet according to a third embodiment of the present invention is affixed.
FIG. 6 is a cross-sectional view of a propulsion pipe to which a resin sheet according to a third embodiment of the present invention is attached.
FIG. 7 is a front view showing a state where a resin tube according to a fourth embodiment of the present invention is wound in a reciprocating manner.
FIG. 8 is a cross-sectional view taken along the line CC.
FIG. 9 is an explanatory diagram when the resin cylindrical body of the fifth embodiment of the present invention is inserted into a small-diameter concrete propelling pipe.
FIG. 10 is a front view of a resin tube in which a reinforcing member is disposed in a hollow portion in a sixth embodiment of the present invention.
FIG. 11 is a sectional view taken along the line DD.
FIG. 12 is a front view of a resin sheet with a reinforcing member bonded to the back surface in a seventh embodiment of the present invention.
FIG. 13 is a sectional view taken along line EE.
FIG. 14 is a side view of a resin sheet having an adhesive layer on the back surface in an eighth embodiment of the present invention.
FIG. 15 is a side view of a resin tube having an adhesive layer on the back surface in a ninth embodiment of the present invention.
FIG. 16 is a partial cross-sectional view of a conventional concrete propelling pipe.
[0043]
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Concrete propulsion pipe 11 One end part 12 Other end part 13 Slot 15 Propulsion front end part 16 Rear part 3 Color 4 Injection hole 5 Resin coating 51 Resin tube 51a Cavity part 52 Resin tape 53 Resin sheet 55 Reinforcement member 56 Adhesive part 57 Resin cylinder 58 Adhesive layer F Stepped portion

Claims (4)

Lubricant or filling to be injected between the outer peripheral surface of the propelling pipe and the ground, with an insertion opening at one end in the tube axis direction, a collar fixed at the other end, and an injection hole in the middle. In order to reduce the frictional resistance with the agent, in the concrete propulsion pipe that forms a resin film on the outer peripheral surface of the propulsion pipe excluding the inlet and the injection hole, the resin film is formed of a tube-shaped resin tube, the back surface of the resin tube, during heating has less adhesive strength, concrete propulsion tube, characterized in that to form an adhesive layer in which the adhesive is applied with only the adhesive strength after heating. Lubricant or filling to be injected between the outer peripheral surface of the propelling pipe and the ground, with an insertion opening at one end in the tube axis direction, a collar fixed at the other end, and an injection hole in the middle. In a concrete propulsion pipe that forms a resin film on the outer peripheral surface of the propulsion pipe excluding the inlet and the injection hole in order to reduce frictional resistance with the agent, the resin film is formed of a resin tape formed in a tape shape and, on the back surface of the resin tape, upon heating it has less adhesive strength, concrete propulsion tube, characterized in that to form an adhesive layer in which the adhesive is applied with only the adhesive strength after heating. Lubricant or filling to be injected between the outer peripheral surface of the propelling pipe and the ground, with an insertion opening at one end in the tube axis direction, a collar fixed at the other end, and an injection hole in the middle. In order to reduce the frictional resistance with the agent, in the concrete propulsion pipe that forms a resin film on the outer peripheral surface of the propulsion pipe excluding the inlet and the injection hole, the resin film has a length excluding the inlet. The entire outer peripheral surface is formed of a resin sheet formed in a width that can be covered in the circumferential direction, and an adhesive having a low adhesive force when heated and having an adhesive force only after heating is applied to the back surface of the resin sheet. concrete propulsion tube and forming a the adhesive layer. Lubricant or filling to be injected between the outer peripheral surface of the propelling pipe and the ground, with an insertion opening at one end in the tube axis direction, a collar fixed at the other end, and an injection hole in the middle. In order to reduce the frictional resistance with the agent, in the concrete propulsion pipe that forms a resin film on the outer peripheral surface of the propulsion pipe excluding the inlet and the injection hole, the resin film is formed of a tube-shaped resin tube, the the cavity of the resin tube, concrete propulsion tube, characterized in that arranged by bonding a reinforcing member.

Images